You will almost always learn something by building things. It's not a complete waste of time in that sense.
A better question, I think, would be 'what is my learning objective and is this task the most efficient way to reach it?'. You'll get value either way, but ideally you want to maximize value for the time spent.
So if the project is purely/primarily for learning, identify a concrete goal and select a project that provides deliberate practice targeted at that goal.
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You will almost always learn something by building things. It's not a complete waste of time in that sense.
A better question, I think, would be 'what is my learning objective and is this task the most efficient way to reach it?'. You'll get value either way, but ideally you want to maximize value for the time spent.
So if the project is purely/primarily for learning, identify a concrete goal and select a project that provides deliberate practice targeted at that goal.